Ignition coils (also called spark coils) are induction coils in the automobile's ignition systems, transforming the battery's 12 volts (6 volts in some older vehicles) to the thousands of volts (20 to 30 thousand volts or more) needed to create an electric spark in the spark plugs to ignite the fuel. Some coils have an internal resistor to reduce the voltage and some rely on a resistor wire or an external resistor to reduce the voltage from the car's 12 volt wiring flowing into the coil. They are essentially autotransformers with a high ratio of secondary to primary windings. By "autotransformer," it means that the primary and secondary windings are not actually separated. That is to say, they share a few of the windings.
Using ignition coils are fairly straightforward. Firstly, connecting 8 AA batteries in series provides more than enough current and voltage. The AA batteries should last for a lot of firings, so you might as well connect the batteries together by soldering wires onto them. Secondly, connect the high voltage terminal of your ignition coils to the tip of the spark plugs. The high voltage terminal is at the top center of the coil, with the deep socket. Use wire with good insulation. It’s better to keep the wires a few centimeters apart, and away from any moisture. Then use another wire to connect the body of the spark plug to one of the terminals of the ignition coils. Finally, run two wires from the positive and negative terminals of the ignition coil. A long, but fairly thick wire is a good choice; accordingly, you can trigger your cannon from a safe distance.
Even though ignition coil produces about 10,000 volts, it actually is less dangerous than the 110 volt that comes out of a wall socket. This is because ignition coil does not produce enough current to cause damage. Furthermore, the high output voltages only produce in transients on the input current.
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